V
VanguardLH
2002 Subaru Legacy L non-turbo wagon
I suspect the MAF sensor needs to be cleaned or replaced.
In the car while the MAF sensor is still connected to the wiring harness
and with the car running, I can check the RPM or voltage output from the
sensor output. Another test is to tap the sensor to check if RPM or
voltage bounces around.
Out of the car, I can measure resistance across the sensor output and
ground pins on the sensor. I can also hookup 12V across the 12V and
ground inputs to the MAF sensor, put the meter (RPM or voltage) across
the sensor and ground inputs, and blow across the wire to see if sensor
output changes. The intermittent test by tapping the sensor can also be
performed with the unit out of the car.
The following are what I don't know what to expect for sensor output:
- Does this MAF sensor generate an RPM or voltage output?
- For either RPM or voltage, what is the normal operating range for the
device (when it is powered)?
- When tested after removal from the car, what should be the resistance
across sensor to ground inputs?
I suspect the MAF sensor needs to be cleaned or replaced.
In the car while the MAF sensor is still connected to the wiring harness
and with the car running, I can check the RPM or voltage output from the
sensor output. Another test is to tap the sensor to check if RPM or
voltage bounces around.
Out of the car, I can measure resistance across the sensor output and
ground pins on the sensor. I can also hookup 12V across the 12V and
ground inputs to the MAF sensor, put the meter (RPM or voltage) across
the sensor and ground inputs, and blow across the wire to see if sensor
output changes. The intermittent test by tapping the sensor can also be
performed with the unit out of the car.
The following are what I don't know what to expect for sensor output:
- Does this MAF sensor generate an RPM or voltage output?
- For either RPM or voltage, what is the normal operating range for the
device (when it is powered)?
- When tested after removal from the car, what should be the resistance
across sensor to ground inputs?